Hello,
my task is it to create a specific extraction process. There is a mixture containing water, nitric acid and hydrochloric acid. It is known, that tributyl-phosphate is a solvent, which prefers the extraction of nitric acid compared to hydrochloric acid. The problem is how to use Aspen for this case. I tried different ways step by step, using ELECNRTL as the property method and TBP as a solvent but all the results did not confirm these effects. I hope someone could help me with this or can share similar results with Aspen Plus.
With kind regards
Marc
you can specify the reaction kinetics in the reaction tab and then add the reaction in the distillation column (column-specification-reaction)
At first you need to implement all reactions and interaction parameters relevant for the distribution between solvent and aqueous phase. That will in your case include dissociation of acids etc. You may find the equilibrium constants in literature or have to estimate them from experimental data. When everything is implemented you can check the conformity of the model with experimental data for binary or ternary systems. If the module agrees with the data you can use it in the process simulation.
Hello and thanks for your answers.
The way Kevin Schnabel described shows me some more details. However, there are some things unclear, for example the implementation of the solubility of the two acids (the dissociated acids) in water and in tributylphosphate. So the solubility of HNO3 in tributylphosphate is definetely different to the solubility of HCl in it. I cant really find the concrete way in the ASPEN scheme where to see this and in case to write this down (from literature). I suppose these interactions are part of the "property-part", before the actual simulation design process starts.
Thanks for your explainations!
- Badges
- Science topic